Orange sulfur dye.



UNITED STATES Tatented May 1'7, i964.

PATENT OFFICEC WILHELM EMMERICH, OF HOOHST-ON-THE-MAIN, GERMANY, ASSIGNOR TO FARBWERKE, VORM. MEISTER, LUCIUS & BRUNING, OF HOCHST-ON- THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

ORANGE SULFUR DYE.

SPECIFICATION forming part of Letters Patent No. 760,110, dated May 17, 1904.

Application filed February 25, 1904.

To a whom it may concern:

Be it known that I, VVILHELM EMMERICH,

Ph. D., chemist, a citizen of the Empire of Germany, residing at Hr'jchst-on-the-Main, Germany, have invented new and useful Inuprovements in the Manufacture of an Orange- Oolored Sulfurized Dyestufi, of which the following is a specification.

I have found that if the known toluylene diurea obtained by combining the hydrochlorid of metatoluylenediamin (1:2:4) with potassium cyanate be heated with sulfur a dyestuff is obtained which dyes cotton an orange color in a sulfur alkaline bath.

The process may be carried out, for instance, as follows: Into six kilos of fused sul fur are introduced at 170 to 180 centigrade two kilos of toluylene diurea in such a manner that the mass is kept in fusion. The temperature is then maintained at 220 to 230 centigrade for one hour, and the mass is further heated to 200 to 230 centigrade for fifteen hours.

The pulverized product of reaction is of a dark red-brown, insoluble in water, alcohol, and concentrated sulfuric acid, soluble with difiiculty in cold caustic-soda lye or alkali-sul- Serial No. 195,285. (No specimens.)

fid solution, and soluble with a brown color in hot concentrated caustic-soda lye or hot alkali sulfid. On evaporating the alkali-sulfid solution the dyestuff is obtained in a form soluble in water.

The dyeings obtained with the alkali-sulfid solution are of orange color fast to light and soap and do not change even when boiled with sodium carbonate or a solution of acids.

Having now described my invention, what I claim is- As a new product the dyestuff obtained as herein described by heating toluylene diurea with sulfur, being a dark red-brown powder, soluble in hot caustic-soda lye and sodiu1nsulfid solution with a brown color; on evaporating the sodium-sulfid solution, the dyestufl' is obtained in a form soluble in water, the solution dyeing cotton a bright and fast orange color.

In testimony that I claim the foregoing as my invention 1 have signed my name in presence of two subscribing witnesses.

WILHELM EMMERIOH.

Witnesses:

ALFRED Bmsnors, JEAN GRUND. 

